Application of a DRAINMOD-based watershed model to a lower coastal plain watershed
This is a case study for applying DRAINMOD-GIS, a DRAINMOD based lumped parameter watershed model to Chicod Creek, a 11300 ha coastal plain watershed in North Carolina which is not intensively instrumented or documented. The study utilized the current database of land-use, topography, stream network, soil, and weather data available to the State and Federal agencies. Methods for collecting, evaluating, and formatting watershed data for model input are described. The study demonstrated that the lumped parameter model may be used to characterize the hydrology and water quality of Chicod Creek. Hydrology predictions were within 1% of the measured data. Predicted mean daily flow weighted concentration compared well with the measured data. Mean annual delivery ratios of each field ranged from 59% to 99% with a watershed mean of 76%. Application of the model to evaluate the effects of changing land are presented.